Method of making steel-cored aluminium cable



April 1969 TATSUO KURATOMI 3,44,721

METHOD OF MAKING-STEELCORED ALUMINIUM CABLE Filed May 51, 1967 INVENTORTA TS UO K URA TOM] United States Patent Ofice 3,440,721 Patented Apr.29, 1969 3,440,721 METHOD OF MAKING STEEL-CORED ALUMINIUM CABLE TatsuoKuratomi, Chigasaki-shi, Japan, assignor to T akeo Kagitani, Tokyo,Japan Filed May 31, 1967, Ser. No. 642,402 Int. Cl. H01b 13/02, 7/04U.S. Cl. 29-624 1 Claim ABSTRACT OF THE DISCLOSURE This inventionrelates to a method of working steelcored aluminum cables.

According to the present invention, two or more grooves are formed onthe sides of an aluminum strip, the sides holding each groove are formedto be handshaped projections, a steel core is inserted into each grooveand is embraced and held with said projections and then the aluminumstrip is formed to be circular in the cross-section.

An object of the present invention is to very simply provide a method ofmaking an electric cable from an aluminum strip having a triangular,square or hexagonal crosssection.

Another object of the present invention is to provide a method of makinga steel-cored aluminum cable high in the flexibility.

In the accompanying drawings,

FIG. 1 is a cross-sectional view of an electric cable having two steelcores according to the present invention;

FIG. 2 is a view showing a producing process of the cable in FIG. 1;

FIG. 3 is a cross-sectional view of an electric cable having three steelcores according to the present invention;

FIG. 4 is a view showing a producing process of the cable in FIG. 3.

The present invention shall be detailed with reference to theaccompanying drawings.

Such steel-cored aluminum cable containing two or more steel cores as isshown in FIGS. 1 and 3 is made by forming two or more grooves 2 on thesides of an aluminum strip 1 having any proper cross-section, formingband-shaped projections 3 defining each groove 2, inserting a steel core4 into said groove 2, then bringing down said projections 3 so as toembrace and hold the steel core 4 and forming the aluminum strip 1 byany proper means so that its contour may be columnar.

The proper number of the steel cores to be used may be two or more. Alsothe completed cable may be twisted so as to be easy to wire.

According to the present invention, an electric cable containing steelcores can be made from an aluminum strip having any proper triangular,square or hexagonal cross-section by a very simple process. Further, inthe steel-cored aluminum cable made by the method of the presentinvention, as two or more comparatively fine steel cores can be used tobe contained, there is an effect that the flexibility is high.

What is claimed is:

1. A method of making steel-cored aluminum cables comprising steps offorming two or more longitudinal grooves on the sides of an elongatedaluminum strip, forming the sides defining each grooveto be band-shapedprojections, inserting a steel core into each groove, deforming saidprojections to embrace and hold said steel core and then forming thealuminum strip to be circular in the cross-section.

7 References Cited UNITED STATES PATENTS 1,292,659 1/ 1919 Speed.1,365,117 1/1921 Mees 29-509 X 2,132,235 10/1938 Green 174-128 X2,250,907 7/ 1941 Edwards 174-128 2,395,878 3/1946 Keene 29-5092,887,762 5/ 1959 Dobell. 3,201,862 8/ 1965 Gotoh 29-509 X 3,236,9382/1966 Toedtman. 3,264,404 8/1966 Trebby et al 174-130 CHARLIE T. MOON,Primary Examiner.

US. Cl. X.R.

